source: rtems/cpukit/posix/src/mqueuerecvsupp.c @ fcd0c90

4.104.114.84.95
Last change on this file since fcd0c90 was fcd0c90, checked in by Jennifer Averett <Jennifer.Averett@…>, on Jan 5, 2000 at 5:11:36 PM

+ Added check for reading from a write only queue.
+ Added ability to return message priority from the core.

  • Property mode set to 100644
File size: 2.6 KB
Line 
1/*
2 *  NOTE:  The structure of the routines is identical to that of POSIX
3 *         Message_queues to leave the option of having unnamed message
4 *         queues at a future date.  They are currently not part of the
5 *         POSIX standard but unnamed message_queues are.  This is also
6 *         the reason for the apparently unnecessary tracking of
7 *         the process_shared attribute.  [In addition to the fact that
8 *         it would be trivial to add pshared to the mq_attr structure
9 *         and have process private message queues.]
10 *
11 *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
12 *         time.
13 *
14 *  $Id$
15 */
16
17#include <stdarg.h>
18
19#include <pthread.h>
20#include <limits.h>
21#include <errno.h>
22#include <fcntl.h>
23#include <mqueue.h>
24
25#include <rtems/system.h>
26#include <rtems/score/watchdog.h>
27#include <rtems/posix/seterr.h>
28#include <rtems/posix/mqueue.h>
29#include <rtems/posix/time.h>
30
31/*PAGE
32 *
33 *  _POSIX_Message_queue_Receive_support
34 */
35 
36/* XXX be careful ... watch the size going through all the layers ... */
37
38ssize_t _POSIX_Message_queue_Receive_support(
39  mqd_t               mqdes,
40  char               *msg_ptr,
41  size_t              msg_len,
42  unsigned int       *msg_prio,
43  Watchdog_Interval   timeout
44)
45{
46  register POSIX_Message_queue_Control *the_mq;
47  Objects_Locations                     location;
48  unsigned32                            status = 0;
49  unsigned32                            length_out;
50  CORE_message_queue_Submit_types       core_priority;
51 
52  the_mq = _POSIX_Message_queue_Get( mqdes, &location );
53  switch ( location ) {
54    case OBJECTS_ERROR:
55      set_errno_and_return_minus_one( EINVAL );
56    case OBJECTS_REMOTE:
57      _Thread_Dispatch();
58      return POSIX_MP_NOT_IMPLEMENTED();
59      set_errno_and_return_minus_one( EINVAL );
60    case OBJECTS_LOCAL:
61      if ( (the_mq->oflag & O_ACCMODE) == O_WRONLY ) {
62        _Thread_Enable_dispatch();
63        set_errno_and_return_minus_one( EBADF );
64      }
65
66      /* XXX need to define the options argument to this */
67      length_out = msg_len;
68      _CORE_message_queue_Seize(
69        &the_mq->Message_queue,
70        mqdes,
71        msg_ptr,
72        &length_out,
73        the_mq->blocking,
74        &core_priority,
75        timeout
76      );
77     
78      *msg_prio = _POSIX_Message_queue_Priority_from_core( core_priority );
79
80      /* XXX convert message priority from core to POSIX */
81      _Thread_Enable_dispatch();
82      *msg_prio = _Thread_Executing->Wait.count;
83      if ( !status )
84        return length_out;
85      /* XXX --- the return codes gotta be looked at .. fix this */
86      return _Thread_Executing->Wait.return_code;
87  }
88  return POSIX_BOTTOM_REACHED();
89}
90
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